Possible Twinning Operations during Directional Solidification of Multicrystalline Silicon

Jhang, J. W.; Jain, T. A.; Lin, Hao-Hsiung; Lan, C.W.

doi:10.1021/acs.cgd.8b00115

Cited by 10 publications

(4 citation statements)

References 21 publications

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“…Similar results were also reported in a ZEK110 (Mg-1Zn-1Gd-0.6Zr) alloy where the number density of twins nucleated was significantly high, although twin growth was retarded due to the presence of secondary phases [60]. Indeed, twinning in silicon has been observed, mainly (111) twins [61][62][63][64]. This is consistent with the present observations via SADP analysis in Figure 3c.…”

Section: Resultssupporting

confidence: 92%

Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior

et al. 2020

Metals

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Aluminum composites reinforced with ceramic whiskers exhibited a unique combination of high specific strength and superior specific modulus. A 20 vol.% Si3N4w/Al-11.5Si-1.0Mg-0.5Cu-0.5Ni (wt.%) composite was fabricated via squeeze casting in the present study. It was observed that the addition of silicon nitride (Si3N4) whiskers in the Al-Si cast alloy promoted extensive twinning in the eutectic silicon particles due to a coupled role of thermal stresses between the matrix and silicon and residual stresses present in the composite. Double aging peaks were present in the age-hardening curves. The precipitation mechanism involved the formation of Mg2Si and Al2CuMg phases. The presence of Si3N4 whiskers in the composite retarded the nucleation process of Mg2Si precipitate while enhancing its growth rate.

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Section: Resultssupporting

confidence: 92%

Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior

et al. 2020

Metals

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“…2 e). The atomic arrangement of the 3 twin boundary can be either constructed by a 60 °or 180 °twist rotation about < 111 > or < 211 > axes, or a 70.5 °symmetric tilt from < 110 > [34] . Consequently, the {111}, {110} and {211} belong to the coincidence site lattice of 3.…”

Section: Resultsmentioning

confidence: 99%

Dynamic observation of dislocation evolution and interaction with twin boundaries in silicon crystal growth using in – situ synchrotron X-ray diffraction imaging

et al. 2021

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The grown-in dislocation dynamics and interaction mechanisms with growth twins are investigated in-situ during the directional solidification of silicon crystal. The melting, solidification and cooling down process is performed in a dedicated installation at the European synchrotron radiation facility and is fol-lowed by X-ray Bragg diffraction imaging techniques (X-ray topography) at the mesoscale in real-time. Existing dislocations in the seed are observed to propagate in the up-grown crystal via replicas. They ex-pand vertically with the moving solid-liquid interface being always aligned perpendicular to the growth front. During the solidification process when they meet a growth twin lamella ( 3{111}), they neither pile-up nor transmit through the boundary. They are blocked by the twin, but they continue to move laterally behind the growth front due to the thermomechanical stresses in the system. The existence of dis-locations at the solidliquid interface, their evolution and interaction with twin boundaries is discussed, as growth proceeds, based on a detailed crystallographic analysis of the system.

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“…4 C and D and 6 C and D ). Twinning commonly occurs during crystallization and is frequently observed in solidification processes (73, 74). There are several conditions that can cause twinning, some of which can happen after initial crystallization, such as gliding twinning or transformation twinning (75).…”

Section: Discussionmentioning

confidence: 99%

Crystal growth kinetics as an architectural constraint on the evolution of molluscan shells

Schoeppler

Lemanis

Reich

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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Molluscan shells are a classic model system to study formation–structure–function relationships in biological materials and the process of biomineralized tissue morphogenesis. Typically, each shell consists of a number of highly mineralized ultrastructures, each characterized by a specific 3D mineral–organic architecture. Surprisingly, in some cases, despite the lack of a mutual biochemical toolkit for biomineralization or evidence of homology, shells from different independently evolved species contain similar ultrastructural motifs. In the present study, using a recently developed physical framework, which is based on an analogy to the process of directional solidification and simulated by phase-field modeling, we compare the process of ultrastructural morphogenesis of shells from 3 major molluscan classes: A bivalve Unio pictorum, a cephalopod Nautilus pompilius, and a gastropod Haliotis asinina. We demonstrate that the fabrication of these tissues is guided by the organisms by regulating the chemical and physical boundary conditions that control the growth kinetics of the mineral phase. This biomineralization concept is postulated to act as an architectural constraint on the evolution of molluscan shells by defining a morphospace of possible shell ultrastructures that is bounded by the thermodynamics and kinetics of crystal growth.

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Possible Twinning Operations during Directional Solidification of Multicrystalline Silicon

Cited by 10 publications

References 21 publications

Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior

Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior

Dynamic observation of dislocation evolution and interaction with twin boundaries in silicon crystal growth using in – situ synchrotron X-ray diffraction imaging

Crystal growth kinetics as an architectural constraint on the evolution of molluscan shells

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